weed

Hi there. One of our boys, Jett - was just enjoying some time in the garden. I noticed he was nibbling on bindweed and quickly ran over to his run to stop him, as I was unsure as to whether pigs can eat this stuff. Please can someone advise? I’m a bit worried. He seems okay for the time being...

I don't know whether to graze my Guinea pigs on weed killer. It's been a couple months and lots of rain.